Conditionally apply an attribute (AngularJS) - javascript

The issue is when I try to conditionally apply a 'has-dropdown' attribute, I get the following Angular transclusion error:
Error: [$compile:ctreq] Controller 'hasDropdown', required by directive 'ngTransclude', can't be found!
It references angular.js line 9563
. The logic I am trying to apply is:
If the subNav array is empty, then do not display the 'has-dropdown' attribute in the element.
If it is not empty, then add the 'has-dropdown' attribute.
Anything that I'm missing?
<code>
<li ng-repeat="nav in app.mainNavItems"
{{app.mainNavItems.subNavs.length > 0 ? "has-dropdown" : ""}}>
</code>

You can't do this in this way. You should create a directive, which on compile stage should check if app.mainNavItems.subNavs.length > 0 and add attribute with $element.attr('has-dropdown')
Something like this:
var myModule = angular.module(...);
myModule.directive('directiveName', function($parse) {
return {
restrict: 'A',
compile: function compile(tElement, tAttrs, transclude) {
if($parse(tAttrs.directiveName)()) {
tElement.attr('has-dropdown');
}
}
};
});
template:
<li ng-repeat="nav in app.mainNavItems" directive-name="app.mainNavItems.subNavs.length > 0">
Note: not tested, just from the top of my head..

Related

AngularJs Directive update

I want to update my directive content only at some desired places, but not at others. I have simulated my problem here:
http://jsfiddle.net/Lvc0u55v/2945/
The problem is, I have an 'editor' directive which is applied in two places:
<span class="editor1" editor ></span>
<span class="editor2" editor ></span>
I want to update the content of span class="editor1" on button click.
How do I do it?
Why not go with a relatively Angularesque approach by isolating the scope of the directive and to a maximum extent, avoid jQuery in your logic.
So you could have your directive defined as such:
.directive('editor', function() {
return {
scope: {
upd : '=',
editordata : '=data'
},
template: '<div>{{editordata}}</div>',
controller: function($scope, $rootScope, $element) {
$rootScope.$on('update', function(evt, data) {
if(data.upd === $scope.upd){
$scope.editordata = data.txt;
}
})
},
link: function(scope, el, attr) {}
}
})
Here, you are passing the required information which the editor directive depends upon through its scope, namely upd (which I suppose is how you want to uniquely identify the items by) and the text data.
Meanwhile, you can define a list of the editor items in the common parent controller MyCtrl and iterate over them in the DOM with ng-repeat.
// MyCtrl controller
$scope.list = [
{upd: 'editor1', data: 'original data for editor1'},
{upd: 'editor1', data: 'original data for editor2'}
]
<!-- HTML -->
<div ng-repeat="item in list" upd="item.upd" data="item.data"></div>
Demo
You can check if the current directory has the "editor1" class and if so complete your logic.
You can look at this example :
element[0].querySelector('.editor1') !== undefined'

angularJS how to change attrs in directive's link

I set a progress in my app
I want to controll The progress in angular's directive
but how can I change data-value and data-total in directive's link func?
app.html
<div class="ui indicating small progress" data-value="39" data-total="50" plan-progress>
<div class="bar">
<div class="progress"></div>
</div>
</div>
In this html, I want change data-value and data-total
I try this:
app.js
todoApp.directive('planProgress', function() {
return {
link: function(scope, elem, attrs) {
attrs.value = 10
attrs.total = 20
elem.progress();
}
};
});
But it doesn't work
so I want to know how to change it in my directive?
Use attrs.$set() in your link function and recompile the element. Also, don't forget to inject the $compile service to your directive.
In your html you've added the directive as an attribute but didn't mention it in the restrict value in your directive definition. You need to mention it in directive definition.
See the code bellow:
todoApp.directive('planProgress', function($compile) {
return {
restrict: 'A',
link: function(scope, elem, attrs) {
attrs.$set('value', 10);
attrs.$set('total', 20);
$compile(elem)(scope);
}
};
});
Simply use :
attrs["data-value"] = 10;
attrs["data-total"] = 20;
You don't want to use attrs.data-total = 20 because the - will force a subtraction.
It's always legal in javascript to use x[keyName] instead of x.keyName, and you must use this second notation when keyName is a strange key such as **$^ùjsls* or data-value. A more useful case is when the key is a variable.
On last thing : as you do, you will always rewrite the coder's inputs. It may have sense, but it's not very elegant.

AngularJS - inject string from model to HTML's tag name

is it possible to inject string into html's tag name with angular?
Something like this:
<div ng-repeat="type in types">
<bettype-{{type.id}}></bettype-{{type.id}}>
</div>
The output I need is:
<bettype-1></bettype-1>
<bettype-2></bettype-2>
I am also using polymer (this way I am creating the custom html tags).
I think the best solution would be to create a directive which creates custom elements, something like:
.directive('bettype', function($compile) {
return {
restrict: 'E',
compile: function($element, $attr) {
return function($scope, $element, $attr) {
// Create new element here with $attr.number
var number = $attr.number,
element = angular.element('<bettype-'+number+'></bettype-'+number+'>');
// Replace newly created element
$element.replaceWith(element);
$compile($element)($scope);
}
}
}
});
Not sure if that will work, but probably that's the way to go...
Note: I don't think it\s a good idea to have dashed separated elements like bettype-1..

AngularJS ng-switch without extra DOM

I have a custom directive and an object myObj on the current $scope (inside an ng-repeat).
If the object has a type of html, I want to use one template:
<span ng-bind-html="myObj.html"></span>`
Otherwise I want to use a different template:
<span>{{myObj.value}}</span>`
My problem
This is invalid because a custom directive template must contain exactly one root node:
<span ng-if="myObj.type==='html'" ng-bind-html="myObj.html"></span>
<span ng-if="myObj.type!=='html'">{{myObj.value}}</span>
This is invalid because it destroys my page with extra DOM: (wrapping all my spans (there could be thousands) in unnecessary ng-switch nodes...)
<ng-switch on="myObj.type">
<span ng-switch-when="html" ng-bind-html="myObj.html"></span>
<span ng-switch-default>{{myObj.value}}</span>
</ng-switch>
My Question
Is it possible to have a directive pick it's template based on the result of a switch, without creating extra unnecessary DOM? For example, you can specify replace: true when creating a directive - is it possible to similarly have an ng-switch where the result replaces the switch tag itself?
Edit
My Directive:
return {
replace: true,
controller: 'ChunkController',
scope: {
chunk: '=deChunk'
},
templateUrl: de.partial.chunk,
link: function (scope, el, attr, ctrl) {
el.on('keydown', handleKeypress.bind(ctrl));
el.on('click', ctrl.showValue);
}
};
And its usage:
<div class="content" contenteditable="{{node.type!=='static'}}">
<div data-ng-repeat="chunk in node.chunks" data-de-chunk="chunk"></div>
</div>
With the intent that the child <div> will be replaced with the sequence of <span>s from above.
I wouldn't even bother if you are storing the html in a service just check to see if a value for myObj.html exists in the object and if it does compile and bind the html in the linker function instead of using ng-bind-html
something like this maybe:
myapp.directive('something',function($compile){
return {
link: function(scope,elem,attrs) {
var obj = scope.$eval(attrs.something);
if(obj.html) {
var html = angular.element($compile(obj.html)(scope));
elem.append(html);
} else {
//go get the data and set obj.html
}
}
}
});

Angularjs/Jquery data()

How to attach arbitrary data to an html element declaratively, and retrieve it.
Please see the code. http://plnkr.co/edit/sePv7Y?p=preview
Angular has the jQuery data() support.
So, I want to attach data to each li element (say _data = node ) in the template, and later on to retrieve it using
var li = elm[0]....
console.log('li-', li.data('_data'))
li - {id:1}
Code:
'use strict';
var app = angular.module('Directives', []);
app.controller('MainCtrl', function ($scope) {
$scope.data = [
{id:1}, {id:2}, {id:3}
];
});
app.directive('test', function ($timeout) {
return {
template: '<li class="ch" ng-repeat="node in data">' +
'<span class="span2">' + 'id - {{node.id}}' + '</span>' +
'</li>',
restrict: 'A',
link: function (scope, elm, attrs) {
console.log(elm[0].children);
}
};
});
Edit:
Updated the code with how I like to set data.
template: '<li class="ch" ng-repeat="node in data" data-node="node">' +
couldn't select the li element properly now to see whether it is working
tried,
elm[0].children[0].data()
elm.children[0].data()
etc..
First of all, if it were some third party lib that you are trying to integrate with angular, that might be ok, but now you're generating DOM with angular and embedding data in the DOM. This is very strange.
Second, your test directive template uses ngRepeat, which creates isolate scope and you won't be able to access li items declaratively. You will have to use DOM traversal, which is also not very angular-way-ish.
Third, your view should be bound to model by angulars two-way bindings. Do not try to simulate opposite behaviour on top of that. Either you should not use angular or you should change your approach to your problem, because it will be pain to develop and maintain otherwise.
I would provide a real answer if you could describe what are you trying to achieve and why exactly do you need that model in data. Now the easiest solution would be ditching test directive and rewriting it as such:
controller's template:
<ul>
<li ng-repeat="node in data" model-in-data="node">
<span class="span2">id - {{node.id}}</span>
</li>
</ul>
directive modelInData
.directive('modelInData', function($parse) {
return {
restrict: 'A',
link: function($scope, $element, $attrs) {
var model = $parse($attrs.modelInData)($scope);
$attrs.$set('data', model);
}
}
});
Here each li element adds it's model to the data attribute.

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